Earlier quoted context omitted.
If the signal is being sent, you can be pretty sure that due to the intrinsic efficiency-maximization that biological systems perform then most likely the mechanism for detecting and acting upon it has been evolved by other organisms, especially for something as fitness-critical as stress.
It's a nice thought. But many humans aren't able to do that with each other, so it seems like a high bar for a potato.
"There is considerable overlap between the intelligence of the smartest bears and the dumbest tourists"
~ Quote by a forest ranger at Yosemite National Park, on why it is hard to design the perfect garbage bin to keep bears from breaking into it.